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Updated: Jul 7, 2026
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Fiber Type and Subcellular-Specific Analysis of Lipid Droplet Content in Skeletal Muscle
Published on: June 8, 2022
Intramuscular lipid oxidation and obesity
1Human Performance Laboratory, Department of Exercise and Sport Science, East Carolina University, Greenville, North Carolina 27858, USA. houmardj@ecu.edu
Summary
Obesity is linked to reduced fatty acid oxidation (FAO) in skeletal muscle, impairing lipid metabolism. This defect may contribute to insulin resistance and weight gain, and is not corrected by weight loss.
Area of Science:
- Metabolic research
- Skeletal muscle physiology
- Obesity studies
Background:
- Accumulating evidence suggests reduced lipid oxidation in skeletal muscle of obese individuals.
- Decreased fatty acid oxidation (FAO) is observed across various models, from whole-body to cellular levels.
- This reduction is linked to impaired enzyme activity, promoting lipid storage over oxidation.
Purpose of the Study:
- To review evidence supporting reduced muscle fatty acid oxidation (FAO) in obesity.
- To explore the implications of impaired FAO in skeletal muscle for metabolic health.
- To discuss the relationship between reduced FAO, weight gain, and insulin resistance.
Main Methods:
- Review of existing scientific literature and studies.
- Analysis of data from whole-body measurements.
- Examination of isolated skeletal muscle preparations and cell culture studies.
Main Results:
- Consistent evidence shows depressed fatty acid oxidation (FAO) in skeletal muscle of obese individuals.
- Reduced FAO is associated with decreased activity of key metabolic enzymes.
- Impaired FAO may lead to increased lipid partitioning towards storage in muscle cells.
Conclusions:
- Reduced skeletal muscle fatty acid oxidation (FAO) is a characteristic feature of obesity.
- This defect in FAO may significantly contribute to the development of insulin resistance.
- Weight loss interventions do not appear to reverse the impaired FAO in obese individuals.
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